Study of Resiniferatoxin for Knee Pain in Moderate to Severe Osteoarthritis

Phase 1b Double-blind Study to Assess the Safety, Tolerability and Preliminary Efficacy of Intra-articular Administration of Resiniferatoxin Versus Placebo for the Treatment of Pain Due to Moderate to Severe Osteoarthritis of the Knee

This study evaluates the safety of resiniferatoxin in patients with moderate to severe knee pain due to osteoarthritis.

Study Overview

• Status: Completed
• Conditions: Osteoarthritis, Knee; Pain, Knee
• Intervention / Treatment: Drug: Resiniferatoxin; Drug: Saline

Detailed Description

This study is to evaluate the safety of resiniferatoxin administered intra-articularly to subjects with moderate to severe knee pain due to osteoarthritis (OA). It is also to assess the preliminary efficacy of resiniferatoxin to relieve knee pain when walking.

• Study Type: Interventional
• Enrollment (Actual): 94
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • California
    • Los Angeles, California, United States, 90048
      • Snibbe Orthopedics
  • Florida
    • Miami, Florida, United States, 33136
      • University of Miami/Sylvester Comprehensive Cancer Center
  • Massachusetts
    • Boston, Massachusetts, United States, 02115
      • Brigham & Women's Hospital
  • Texas
    • Houston, Texas, United States, 77004
      • Hermann Drive Surgical Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 33 years to 83 years (Adult, Older Adult)
• Accepts Healthy Volunteers: No
• Genders Eligible for Study: All

Description

Inclusion criteria:

1. Age: 35 years to 85 years
2. Diagnosis of moderate to severe pain due to OA: Moderate to severe osteoarthritis, based on American College of Rheumatology (ACR) criteria
3. BMI < 45 kg/m2
4. Pain in the target knee has been treated with at least 2 analgesic agents, including at least one NSAID
5. Prior failure in at least two prior analgesic agents (at least one NSAID)
6. Willing to abstain from other intra-articular treatments of the knee or any knee surgery for at least 24 weeks after treatment
7. Ability to comply with the study and give informed consent
8. If on an opioid medication, stable dose for at least 4 weeks prior to injection with no increase in dose leading up to study injection
9. If on NSAIDs, be on a stable analgesic regimen for at least 4 weeks prior to injection
10. If on pain regimens other than opioid medication or NSAIDs, be on a stable regimen for at least 30 days
11. Is in good general health and is considered to have a physical status that is American Society of Anesthesiologists (ASA) category ≤ 3
12. Able to comply with study procedures, including the recording of daily questionnaires

Exclusion Criteria:

1. Has evidence or history of a coagulopathy or hemostasis problem at Screening or Baseline (Day 1)
2. Treatment knee injections with corticosteroids within 30 days or hyaluronic acid within 3 months prior to the procedure
3. If on opioid analgesics, an upper limit of 30 mg/day of oral morphine sulfate, 20 mg/day of oxycodone, 30 mg/day of hydrocodone, or 300 mg/day of tramadol, or equivalent

4. Any of the following lab abnormalities within one week of the treatment day:

   • Platelet count <100,000 cells/mm3
   • Total neutrophil count <1500 cells/mm3
   • Serum creatinine ≥ 1.5 x ULN
   • Alanine aminotransferase (ALT) > 3.0 x ULN
   • Aspartate aminotransferase (AST) > 3.0 x ULN
   • Alkaline phosphatase > 2.0 ULN
   • Bilirubin > 1.5 x ULN
   • INR > 1.5 x ULN
   • Temperature ≥ 100.4°F or other evidence of an infection
5. Concurrent use of opioids for indications other than knee pain
6. History of substance abuse
7. Has an allergy or hypersensitivity to chili peppers, capsaicin, resiniferatoxin or radiographic contrast agents
8. Female subjects who are pregnant at Screening or are planning on becoming pregnant, or are currently breastfeeding
9. Subjects with any medical condition or comorbidities that could adversely impact study participation or safety, conduct of the study, or interfere with pain assessments
10. Subjects who have participated in a clinical study of an investigational drug within 4 half-lives of Screening or are scheduled to receive and investigational agent while participating in this study
11. Sensory peripheral neuropathy that is CTCAE Grade 2 or higher at Screening
12. Arterial or venous thrombi, myocardial infarction, admission for unstable angina, cardiac angioplasty, or stenting within 12 months prior to Screening
13. Evidence or history of any hemorrhage or bleeding event that is higher than CTCAE Grade 1 within 4 weeks prior to injection.
14. Known human immunodeficiency virus (HIV) or acquired immunodeficiency syndrome-related illness, acute or history of chronic hepatitis B or C. Positive tests for HIV-1 or -2 antibodies, hepatitis B surface antigen, or hepatitis C antibodies.
15. Concurrent medical or arthritic conditions that could interfere with evaluation of the index knee joint including fibromyalgia, rheumatoid arthritis, or other inflammatory arthropathies affecting the knee joint
16. Subjects with significant pain in other joints may be excluded at the discretion of the investigator
17. Subject has undergone arthroscopic or open surgery to the knee within 6 months of the planned injection day
18. Subject has undergone replacement surgery of the treatment knee
19. Presence of surgical hardware or other foreign bodies in the treatment knee

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Randomized
• Interventional Model: Parallel Assignment
• Masking: Double

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Resiniferatoxin; Resiniferatoxin is administered as a one-time dose, intra-articularly at a dose level of 5ug, 12.5ug, 20ug, 25ug, or 30ug.	Drug: Resiniferatoxin; Resiniferatoxin is a compound purified from natural sources.; Other Names: RTX
Placebo Comparator: Saline; Saline is administered as a one-time dose, intra-articularly.	Drug: Saline; Saline is a normal physiological solution; Other Names: Normal saline

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Safety measurement	Incidence and severity of adverse events	baseline through week 52

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Improvement of knee pain when walking	Improvement in pain score versus baseline using the WOMAC Osteoarthritis Index question A1 (pain on walking, 11-point numerical rating scale)	baseline through week 52

Collaborators and Investigators

• Sponsor: Sorrento Therapeutics, Inc.

Study record dates

Study Major Dates

• Study Start (Actual): July 12, 2018
• Primary Completion (Actual): April 13, 2020
• Study Completion (Actual): February 11, 2021

Study Registration Dates

• First Submitted: May 7, 2018
• First Submitted That Met QC Criteria: May 18, 2018
• First Posted (Actual): May 31, 2018

Study Record Updates

• Last Update Posted (Actual): April 1, 2021
• Last Update Submitted That Met QC Criteria: March 30, 2021
• Last Verified: March 1, 2021

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Joint Diseases; Musculoskeletal Diseases; Rheumatic Diseases; Arthritis; Osteoarthritis; Osteoarthritis, Knee
• Other Study ID Numbers: PTVA OA-001

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: No

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No